All good advice given so far. Tell them you're having a rough time, tell them you don't really feel like talking about it, tell them you appreciate their concern...."tickle their ears". We all know what they want to hear. And I'm sure you remember as an elder how much of your time is taken up with other things - if you can sufficiently satisfy their curiosity they will leave you alone for quite a while. They simply don't have the time to be THAT concerned about your "spiritual well-being".
Best of luck, I remember it is a nerve-wracking time. Mostly, they eventually just lose interest.
My other suggestion is to just ignore them. Don't answer the door, use caller ID. That's what it's there for. :)